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Association of leptin receptor gene polymorphisms and essential hypertension in a Chinese population

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Abstract

Background: The leptin receptor (LEPR) is an important regulator of leptin activity and resistance. Several single nucleotide polymorphisms (SNP) of LEPR have been linked to diseases accompanying obesity and/or obesity-related diseases in different populations. However, the results from published studies remain inconsistent rather than conclusive. Aim: To investigate whether LEPR SNP are associated with essential hypertension and related metabolic traits in Chinese subjects. Materials and methods: A total of 544 Chinese patients with hypertension and 357 non-hypertensive subjects were screened. The genotypes of LEPR polymorphisms were determined by PCR-restriction fragment length polymorphism methods. Demographic and biochemical characteristics including waist circumference, waist-to-hip ratio, body mass index (BMI), lipids profiles, glucose metabolism, and leptin levels were obtained for analysis. Results: This case-control study showed associations between the frequencies of AA genotype and A allele of Gln223Arg and hypertension (p=0.029, p=0.002, respectively). Furthermore, the Gln223Arg polymorphism was significantly associated with plasma leptin levels (p<0.001), while no correlations between Lys109Arg SNP and hypertension were found. Multivariate logistic regression analysis evidenced that A allele carriers of Gln223Arg (AA+AG) showed higher risks of hypertension than GG carriers after adjustment of age and sex (adjusted odds ratio: 1.549, 95% confidence interval: 1.031-2.036, p=0.035). BMI, fasting serum insulin, oral glucose tolernace test (OGTT)-2h glucose, serum leptin, as well as LDL-cholesterol (LDL-C) levels were also independent risk factors of hypertension in this population. In addition, significant associations were observed between the Gln223Arg and Lys109Ar g SNP and serum total cholesterol, LDL-C, and fasting plasma glucose levels in hypertensive patients. Besides, A allele of Gln223Arg had raised diastolic blood pressure, compared with GG carriers (p=0.001). While variance of Lys109Arg was associated with waist-to-hip ratio, OGTT-2h glucose, and homeostasis model assessment of insulin resistance (p<0.05). Conclusions: LEPR polymorphisms may be a marker for susceptibility to essential hypertension in Chinese subjects, and be involved in the development of several features including dyslipidemia and impaired glucose regulation in hypertension subjects.

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Authors and Affiliations

  1. Department of Endocrinology, Nanjing General Hospital of Nanjing Command, Nanjing, Jiangsu Province, P.R. China

    P. Gu, B. Lu, J. Shao & H. Du

  2. Department of Cardiology, Jiangsu Provincial Hospital of Traditional Chinese Medicine, Nanjing, Jiangsu Province, P.R. China

    W. Jiang

  3. Department of Neurology, Nanjing General Hospital of Nanjing Command, Nanjing, Jiangsu Province, P.R. China

    M. Chen

  4. Department of Cardiology, Nanjing General Hospital of Nanjing Command, Nanjing, Jiangsu Province, P.R. China

    S. Jiang

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  1. P. Gu
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Correspondence to J. Shao.

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Gu, P., Jiang, W., Chen, M. et al. Association of leptin receptor gene polymorphisms and essential hypertension in a Chinese population. J Endocrinol Invest 35, 859–865 (2012). https://doi.org/10.3275/8238

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